CORROSION-RESISTANT and RUST-FREE. The Flame King 1 lb. refillable propane cylinder is highly resistant to rust and saltwater corrosion, perfect for fishing, camping, backpacking, and any outdoor adventures. Built from high-grade aluminum, this tank has a bright and shiny smooth finish and clean, dry, and flake-resistant interiors. It fits all appliances that today's non-refillable tanks work with. This propane bottle is legally and lawfully refillable and transportable - just like your BBQ tank is. Our unique and patented valve design is not available from any other manufacturer. These refillable propane cylinders are perfect for practically every Mr. Heater, Weber, Coleman and similar outdoor type applications that would fit a disposable tank. Spend your money wisely and buy the last 1 lb. propane cylinder you will ever need. Tossing a single-use disposable tank is just a silly waste of resources and can be a potential huge problem in the waste stream. Join the eco-revolution. Please note: these cylinders fill fastest and safest with our commercial Flame King refill adapter - not included but available with our Refill Kit. High-grade aluminum construction, X-Ray and Hydrostatic Tested, DOT and TC Certified for 12 years (10 years in Canada) - UL1769 listed.